共查询到18条相似文献,搜索用时 234 毫秒
1.
2.
3.
4.
5.
采用自主研发的比色高温监测系统,实时检测板坯表面温度,依据热传导理论建立了加热炉钢坯加热过程的数学模型,采用有限元法对数学模型进行了离散化分析,开发了钢坯内部中心温度随表面加热过程变化的数值模型。根据检测的钢坯表面温度及开发的数值模型实时通过有限元法[1]估算钢坯中心温度,与传统的通过热电偶探测相比精确了0.46%~0.53%[2];同时根据检测的钢坯表面与中心温差对实时建立温度补偿模型起到辅助作用,同时可以将温度补偿数据实时传递给燃烧优化控制系统,从而建立了基于钢坯表面温差补偿模型的燃烧优化控制,优化调整燃烧工艺,保证了钢坯加热质量,实现了节能降耗和效益提升。 相似文献
6.
7.
8.
利用MSC.Marc软件建立蓄热式加热炉内板坯三维温度场有限元计算模型。结合首钢中厚板轧钢厂加热炉实际生产情况,模拟计算板坯加热过程中温度场的情况。根据板坯温度“黑匣子”试验结果,验证了模型计算结果的准确性,为研究加热工艺对板坯温度场影响、优化板坯加热温度制度提供了科学依据。 相似文献
9.
10.
11.
进行了0.72%C-1.30%MnU71Mn高碳钢250 mm×280 mm×6000 mm连铸坯加热时的传热有限元模拟和通过非线性回归分析,得出钢坯在加热后钢坯脱碳深度d (mm)与加热前脱碳深度d0 (mm)、钢坯表面温度 T(K)和加热时间 t (min)之间关系的数学模型: d=d0+(2.132×10-7T2-0.0002T+0.0163)·(0.208 t0.5-d0)。实测结果表明,模型的相对预报误差≤3.2%。根据模型计算得出铸坯的优化工艺为预热段1150℃ 86min,加热段1250℃ 131min,均热段1230℃ 68min。检验结果表明,采用优化工艺,成品脱碳深度可降低20%左右。 相似文献
12.
13.
The present work presents methodology and development of a mathematical model for prediction of the influence of oxide scale on heat transfer during reheating of steel in an industrial furnace. In this developed model, temperatures inside the steel billet were measured and with thermocouples at selected places and were collected by a water cooled computer that was traveling inside the slab. CFD is used to calculate the flow field inside of a furnace. The mass‐transfer coefficient of the scale formation is obtained by solving the convection mass‐diffusion equation across a boundary layer to the surface of a flat plate. A model for inverse heat conduction is employed to calculate the local surface temperature and heat flux on top of the growing oxide scale layer on a slab moving through a walking beam reheating furnace. By using the inverse method, the transient temperature and heat flux was firstly determined on the surface of the steel. During subsequent computations, the growth of the scale was calculated and the surface temperature of the oxide scale was extracted by using the Cauchy data from the previous calculations. The sensibility of the model on steel physical parameters is studied, and suitable parameters were obtained for heating a low carbon steel plate in the reheating furnace. Results show that the oxide scale layer should not be neglected in reheating models. 相似文献
14.
在钢坯加热过程数学模型的基础上,根据加热炉的生产特点,建立了燃料消耗最低的稳态加热模型。运用最大值原理对加热炉内最优供燃函数及温度场分布进行了数值模拟及优化计算,得出了合理的供热制度,从而实现最佳操作。 相似文献
15.
16.
南钢3 500 mm炉卷轧机生产5 mm×3 150 mm规格Q960高强钢板时,板型瓢曲严重。通过对加热温度、卷取张力、卷取速度、卷取炉炉温、道次压下率等轧制工艺参数进行优化改进,显著改善了热轧态板型,钢板不平度由初期的15~25 mm/m降低至6~12 mm/m,为保证后续调质热处理板型控制效果提供了良好的基础。 相似文献
17.